Morris Minor - otherwise largely user-friendly, but:

Brake Master cylinder: dismantle right hand front suspension, remove torsion bar, finally access the bolts that secure the master cylinder inside the chassis rail. (or CAREFULLY grid heads off bolts without nicking the torsion bar, then replace them fromt he other side, the way it should have been done in the first place)

Heater control valve - easiest to remove the cylinder head.

Bypass hose - either remove water-pump or remove cylinder head, unlsess you retrofit concertina hose.

Gearbox - the support crossmember has two bolts at eather end, that are securid incaptive nuts inside the chassis rails. Result? the bolts rust in the captives, and applying excesive force destroys the captive housing so now the but and bolt go round and round together. ALso the gearbos cover in the car had 38 (if I remember correctly) phillips-headed quarter witworth bolts. The early models had brass ones that did NOT rust in. Later some accountant designated them as mild steel, with the reuslt that they rusted in. Excessive force would strip the Phillips heads, and then you had to drill 38 little bolts out!